ͻ񻣼
"[¹ú¼Ò¼¯Ñµ¶Ó\]ÀñÎï" (À©Õ¹Lucas¶¨Àí) ´«ËÍÃÅ¿ÉÒÔÖ±½Ó´Á±êÌâ 172.40.23.20 24 .1 ´ð°¸¾ÍÊÇÒ»¸öʽ×Ó: $$ {n\choose \Sigma_{i=1}^m w}\times\prod_{i=1}^m {\Sigma_{j=1}^m w_j \Sigma_{j=1}^{j ÔĶÁÈ«ÎÄ
ͻ񻣼
¡¾Ìâ½â¡¿¼Ñ¼ÑµÄì³²¨ÄÇÆõÊýÁÐ ÌâÄ¿ÃèÊö Çó$\Sigma i\times fib[i]$µÄÖµ Êý¾Ý·¶Î§ $n\le2^{31} 1$ $Solution$ ¿´Êý¾Ý·¶Î§¾Í»á×öµÄÌâ... $$ Éè \\ f(n):=ib[n] \\ g(n)=nf(n) \\ s(n)=\Sigma^{i\le n}_{ ÔĶÁÈ«ÎÄ